Computer Science – Information Theory
Scientific paper
2008-08-15
Problems of Information Transmission, vol. 44, no. 3, pp. 33-49, 2008
Computer Science
Information Theory
23 Pages including 4 figures
Scientific paper
For the information transmission a binary symmetric channel is used. There is also another noisy binary symmetric channel (feedback channel), and the transmitter observes without delay all the outputs of the forward channel via that feedback channel. The transmission of a nonexponential number of messages (i.e. the transmission rate equals zero) is considered. The achievable decoding error exponent for such a combination of channels is investigated. It is shown that if the crossover probability of the feedback channel is less than a certain positive value, then the achievable error exponent is better than the similar error exponent of the no-feedback channel. The transmission method described and the corresponding lower bound for the error exponent can be strengthened, and also extended to the positive transmission rates.
Burnashev Marat V.
Yamamoto Hirosuke
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